starting with the fsl.utils package.

Refactored runwindow.py a bit, made code cleaner. The ProcessManger thread class may even be better off as a separate module, as it will probably grow to be quite important.

Removed 'actions' parameter from runwindow.py. The onFinish callback function is now passed the exit code of the child process.

Fixed runtool (and renamed to runwindow). Still thinking about the design of adding in a hook to run stuff when the process has finished.